I always manage to get a seam thread to peak out to the front of the quilt top. I'm not so disciplined about trimming threads as I go along, so more than once I've gotten these threads that somehow get stuck, and I can't pull it through.
My other pet peeve is after unsewing something, I pin it together so the points match up. But somehow, even with the pinning, the points still don't match up. How do the points not match up if they are pinned exactly together?! Arggh!